ACU ! STEAM ® S-15 ELECTRONIC HUMIDISTAT AND OUTDOOR SENSOR INSTALLATION INSTRUCTIONS Aug. 2010 - V1.
ACU-STEAM HUMIDISTAT, version A Features State of Art digital RH sensor ROOM or DUCT mounting Reprogrammable Microcontroller Potentiometer Set-point setting Out-door temperature sensor for Set-point Reset Green (ON/OFF) and Red (warning) status LEDs Specifications Set-point range. . . . . . . . . . . . . . . 20% to 50% Relative Humidity Accuracy. . . . . . . . . . . . . . . . . . . . ±4.5%, without calibration Linearity . . . . . . . . . . . . . . . . . . . .
Installing and Connecting the ACU-STEAM Humidistat and the Outdoor Sensor 1.1 The humidity sensor is located at the lower right side in the wall mount humidistat. Please see Fig.1a. Jumper Terminal Block GND 24VST1 COM ODR ST2 10V Red LED Green LED Humidity sensor Fig. 1a Wall Mount Humidistat 1.2 A three wire control cable (not supplied) has to be connected between the wall (or duct) electronic humidistat and the humidifier electronic board at the three terminals marked “H-STAT”.
1.4 A two wire control cable is required to connect the outdoor sensor to the terminals marked COM & ODR on the electronic humidistat. Please see Fig. 1d. The outdoor sensor is not polarized so there is no wiring polarity to follow.
